quote, "So if you were to use a 10th year pick on a Soulstone, would that also be a waste of a choice? If so, what is your reasoning?" end quote
Hail: imhop, I think vet rewards should be permanent. That is, the list for each year should stay the same, and any new rewards get added to the end, 10th yr, 11yrd, 12th yr, and so on. Because you can not redeem already chosen awards.
I, once again my opinion, If the game gives you something, "Vet Rewards" You should be able to use them right away, without having to say, "Hmmm, I think i will hold on to them, in case there are better ones a few years from now".
Also, some vets rewards are deco only, "Banners", and others have an actual use, Soulstones, commodity box, Ankh of sacrafice, and so on. So, in a way, some vet rewards are Better than others. The Commodity Box as a 1st year reward, is better than a Efreet Statue as a 10yr reward. Because it actually does something.
Nobody is going to trade a Commodity Box for any other first year reward straight up.